Ok am having a problem I had a mishimoto racing thermostat for my h23a vtec i noticed that it was smaller than the stock one so it's the wrong size. so I am guessing the size i got was for a civic it's said on the box it's for civic accord s2000. So now I was thinking it was for the newer cars. I went on mishimoto site to look up the t-stat I only seen two models that only fit the usdm h23a1 and the h22a4 what am thinking if I get it for the h22 h23 it might fit. I would like to know if it can work are if there any other company that makes it for the h23a

 

Why not go for an OEM Thermostat? OEM is more than enough even if your H23A VTEC's a weekend warrior/DD.

 

Why cause I had got the mishimoto fan switch to but now I have no choices to use a stock still I can find the right size